Range benchmarking

Since the IntRange class inherits from the IntProgression class which, in turn, implements the Iterable interface, we can invoke the forEach function:

(0..10).forEach {

}

Decompiled to Java, the code looks like this:

public static final void main(@NotNull String[] args) {
   Intrinsics.checkParameterIsNotNull(args, "args");
   byte var1 = 0;
   Iterable $receiver$iv = (Iterable)(new IntRange(var1, 10));

   int element$iv;
   for(Iterator var2 = $receiver$iv.iterator(); var2.hasNext(); element$iv = ((IntIterator)var2).nextInt()) {
      ;
   }
}

Let's write it and run some benchmarks:

val range = 0..1_000
val array = Array(1_000) { it }

@Benchmark
fun rangeLoop(blackhole: Blackhole) {
    range.forEach {
        blackhole.consume(it)
    }
}

@Benchmark
fun rangeSequenceLoop(blackhole: Blackhole) {
    range.asSequence().forEach {
        blackhole.consume(it)
    ...